How Things Work
CBSE · Class 4 · EVS
Summary of How Things Work for CBSE Class 4 EVS. Key concepts, important points, and chapter overview.
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Overview
Things around us move in different ways. Some objects spin, some float, and some sink. A spinner may slow down and shake before stopping. A paper boat may float properly or flip over. The shape of an object can change what it does in water. These ideas help explain how simple things work in daily li
Key Concepts
Some objects like coins and bangles
Some objects like coins and bangles spin, while erasers do not spin properly. Many things around us spin, such as ceiling fans and potter's wheels.
A spinner with a hole at
A spinner with a hole at the centre appears the same from all sides and remains upright while spinning.
A charkha has a large wheel
A charkha has a large wheel that spins when turned by hand and is used to twist cotton fibre into thread. Mahatma Gandhi used the charkha to make hand
Spinning tops have been used
Spinning tops have been used in India for thousands of years, and clay was used earlier to make them. Lattu is a popular Indian top commonly made of w
Floating or sinking cannot be decided
Floating or sinking cannot be decided only by whether an object is heavy or light. It depends on other factors too. A leaf floats, while an iron nail
Learning Objectives
- To recognise objects that spin and objects that do not spin properly
- To understand why some spinners stay upright and others do not
- To identify common spinning things such as ceiling fans, potter's wheels, charkha, and lattu
- To observe how objects float or sink in water
- To learn that floating and sinking depend on more than just weight
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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